Concrete structure.



PATENTED DEG. 24, 1907.

I AfP. WALKER. CONCRETE STRUCTURE. APPLICATION FILED AUG. 15, 1907.

- atmmqs UmirnD STATEE ARTHUR FRANCIS WALKER, OF ATLANTA GEORGIA.

CONCRETE STRUCTURE.

Specification oi Letters Patent.

Patented Dec. 24, 1907.

Application filed August 15 1907- Serial No. 388,724.

To all whom it may concern:

Be it known that I, ARTHUR FnANoIs' WALKER, a citizen of the UnitedStates of,

A1nei'ioa,.and resident of Atlanta, county of 'Fulton, State of Georgia,have invented certainnew and useful Improvements in Con creteStructures, of which the following is a full and clearspecification,reference being had to the accompanying drawing, in whichFigure 1 is a perspective view of a concrete beam embodying myinvention; Fig. 2 a transverse section thereof showing a slightmodification; Fig. 3 a detail perspective view showing the peculiarformation of the head of the hanger-bolt; and Fig. 4- a verticaltransverse section showing another modification of the channel-formingmeans.

The object of this invention is to provide a concrete beam or otherstructure with a simple support for bolts for shaft and other angers,the support being embedded inthe under side of the beam and forming alongitudinal channel for the reception of the supporting heads of thehanger-bolts and serving to reinforce the beam, as more fullyhereinafterset forth.

A further object, is to provide a hangerbolt which is especially adaptedfor use in connection with my said support and which is adapted to bereadily attached to and do tached from the support and which whenattached will be prevented from axially rotating, as more fullyhereinafter set forth. Referring to the drawing annexed by referencenumerals, 1 designates the concrete structure which in the presentinstance is in i the form'of a beam. Embedded in the mass of concretealong the underside thereof are two angle irons, the vertical members 3of which are parallel and'have their lower longitudinal edges flush withthe lower side of the beam. These vertical members are par allel witheach other and spaced a suitable distance apart, and each is provided atits upper end with an outwardly extending horimental member 4 whichlatter members are also embedded in the concrete and rest dirrctly uponthe mam mass of concrete and 'herefore form strong anchoring means bywhichthe angle irons are rigidly anchored in the mass.

To .separate the vertical members of the angle irons and hold them in afixed position v with respect to each other, tubular separators 5 areplaced between the members at intervals, these separators being clampedin l place rigidly by means of horizontal bolts 6 each of which passesthrough one of the separators and registering holes in the vertical 3members and is provided. with a suitable tightening nut 7. These boltsbesides clamping the separators in placeserve to prevent spreading ofthe vertical members 3 under the strain imposed thereon through thehanger-bol ts.

To form a channel over the angle irons for the reception of the heads ofthe hangers, I secure a cap-piece 8 to the outer edges of the horizontalflanges of the angle irons thus forming a closure which effectuallyprevents concrete from entering the space under the arch during theprocess of molding the conunder the outer edges of the angle iron. It

is desirable that the concrete structure shall be strengthened bysuitable longitudinal reare self-anchoring in a large measure I maydesire to attach suitable anchoring'rods 13 'to the angle irons atintervals. I may also do sire, for the purpose of strengthening theangle irons and the structure, to provide the angle irons with upwardlyextending flanges M, as shown in Fig. 2.

With the above described structure-I may use any suitable form ofhanger-bolt but I prefer the form shown which consists of a suitableheavy hanger bolt or rod 10 having a laterally enlarged head 11 at itsupper end which is adapted to rest upon the upper faces of thehorizontal meml;ers of the angle irons and thus support the hanger. Thehead of the hanger bolt is slightly less in width than thcspacc betweenthe angle irons so that the hanger-bolt may bcreadily inserted andremoved by simply turning the hanger bolt so that the head shall lieparallel with the slot, and to prevent the hanger bolt rotating afteronce inserted a portion of the hanger rod or bolt below the head issquared lit downbctwcon the inner walls of the angle irons and thusprevent the hanger-bolts rotating to a point where they may drop downand out. in inserting and removing the hanger-bolts, this squaredportion 1]" 1'0- crete structure. This cap may be secured to iron While,the main part of the cap engages inforcing rods 12, and While the angleirons at 11 this squared portion being adapted to quires that the hangerbolt shall be pushed up far enough into the channel to bring the loweredge of the squared portion above the bottom of the channel, as shown indottedlines in Fig. 2, in'which position the hanger-bolt may be turnedin either direction.

As shown in Fig. 4, the channel in the beam may be formed by means of asingle piece of sheet metal bent into shape to form the vertical members3*, the horizontal members 4 and the cap piece 8*, thus cheapening thecost of the structure- In this type of structure I prefer embedding apair of the reinforcing rods 12 at a suitable oint below the horizontalmembers 4' an I also prefer turning up into the concrete the lower edgesofthe vertical members3 to form stiffening flanges 14 which are embeddedin the concrete mass and which are preferably connected-to the upwardlyextending anchoring rods 13. To prevent the vertical sheet metal.members 3 from being pressed inwardly toward each other during theconstruction'of the beam, I refer inserting therebetween a suitable WOOen block or rod 15, as shown in dotted lines in Fig. 4. It will beobserved that in order to obtain the maximum stiffening effect of theflanges 14 they are carried up approximately'parallel with the verticalmembers 3*, and fur thermore it will be observed that by keeping theflanges thus close to the vertical members and terminating them short ofthe horizontal members 4*, these members 4 rest directly on the mainmass of the concrete and thus avoid weakening that would follow byextending these flanges 14 upwardly and 'outwardlyaround the channel.These flanges also afford a convenient means for attachin' the anchoringrods 13, and the beam is urther strengthened underneath the horizontalmembers 4* by means of the re-- inforcing rods 12.

Having thus full. described my invention, what I claim and esire tosecure by Letters Patent, is Y 1. In combination, a concrete structurehaving embedded in its under side metallic means forming a channeltherein opening downwardly, and a hanger-bolt having a head portion atits upper end adapted to pass up into said channel and he supportedtherein when turned, said hanger bolt having an angular portion 1.1between said head and the main shank of the hanger bolt, said portionbeing adapted to fit down between the vertical side walls of the channeland thus lock the hanger bolt against rotation.

2. In combination, a concrete structure, a channel-forming deviceembedded in the under side thereof and consisting of sheet metal bentto'form vertical separated members or plates whose lower edges terminateapproximately at the lower face of the concrete structure, horizontalmembers projecting laterally from the upper edges of said verticalmembers and resting directly upon the main mass of concrete, and a capor arch poition connecting the outer edges of the horizontal members andforming a closed channel;

3. In combination, a concrete structure, a channel-forming deviceembedded in the under side thereof and consisting of sheet metal bent toform vertical separated members or plates whose lovs er edges terminateapproximately at the lower face of the concrete structure, horizontalmembers projecting laterally from the upper edges of said verticalmembers and resting directly upon the main mass of concrete, and a capor arch portion connecting the outer edges of the horizontal members andforming a closed chan-- nel, said lower edges of the vertical membersbeing provided with upturned flanges embed'ded in the concrete mass andhaving anchoring rods connected thereto.

4. .In combination, a concrete structure; a channel-forming deviceembedded in the under side thereof and consisting of sheet metal bent toform vertical separated members or plates whose lower edges terminateapproxi' mately at the lower face of the concrete structure, horizontalmembers projecting laterally from the upper edges ofsaid verticalmembers and resting directly upon the main mass of concrete, and a capor arch portion connecting the outer edges of the horizontal members andforming a closed channel, said lower edges of the vertical members beingprovided with upturned flanges embedded in the concrete mass andterminating short the horizontal members andhaving anchoring rodsconnected thereto and extending up into the beam.

5. In combination, a concrete structure, a channel-forming deviceembedded in. the under side thereof and consisting of sheet metal bentto form vertical separated members or plates whose lower edges terminateapproximately at the lower face of the concrete structure, horizontalmembers projecting laterally from the upper edges of said verticalmembers and resting directly upon the main mass of concrete, and a capor arch portion connecting the outer edges of the horizontal members andforming a closed channel, the lower edges of the aforesaid verticalmembers being turned abruptly upward and terminated short of thehorizontal members and provided with anchoring rods extending up intothe beam, and reinforcing rods embedded in the beam under saidhorizontal members. In testimony whereof I hereunto allix my signaturein the presence of two witnesses this 12 day of August 1907.

ARTHUR FRANCIS WALKER,

Vlitnesses:

JACK HEAD, Gno. B. ANIMAN.

